Quick answer
Days until St. Patrick's Day = the date of the next St. Patrick's Day minus your start date. Counting from 10 March 2024 the next one is Sunday 17 March 2024, which is 7 days away.
Pick a start date (it defaults to today). The calculator returns the days, the weeks and days, and the weekday of the date.
Related tools: Days Until Labor Day: Days until US Labor Day (first Monday of September). Days Until Father's Day: Days until US Father's Day (third Sunday of June). Days Until Mother's Day: Days until US Mother's Day (second Sunday of May).
How to use the Days Until St. Patrick's Day
- Optionally, pick counting from.
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Counting from (optional) | A calendar date. Leave blank to use today's date | — |
Formula and method
Formula
days = next occurrence of St. Patrick's Day − start date
Exact integer day arithmetic in UTC.
Finds the next occurrence of St. Patrick's Day on or after the start date using its calendar rule. Dates follow the proleptic Gregorian calendar.
Worked examples
This example is verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Counting from = 2024-03-10.
| Result | Value |
|---|---|
| Days Until St. Patrick's Day | 7 days |
| Date | 2024-03-17 |
| Weekday | Sunday |
| Weeks and days | 1 week, 0 days |
The first line is the headline result (days Until St. Patrick's Day). Below it the days Until St. Patrick's Day lists date, weekday and weeks and days, which describe the same case from other angles. Exact integer day arithmetic in UTC.
About St. Patrick's Day
St. Patrick's Day is 17 March, the feast day of Ireland's patron saint. It is celebrated with parades and green clothing in Ireland, the US and elsewhere. It is not a US federal holiday.
The next dates
Upcoming dates: Monday 17 March 2025; Tuesday 17 March 2026; Wednesday 17 March 2027. The count is zero on the day itself, and once this year's date has passed the calculator moves on to the next one.
Days Until St. Patrick's Day from different start dates
The same calculator run from 1 January of four consecutive years.
| Counting from | Days Until St. Patrick's Day | Date | Weekday |
|---|---|---|---|
| 2026-01-01 | 75 | 2026-03-17 | Tuesday |
| 2027-01-01 | 75 | 2027-03-17 | Wednesday |
| 2028-01-01 | 76 | 2028-03-17 | Friday |
| 2029-01-01 | 75 | 2029-03-17 | Saturday |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Counting from: entering "2024-02-30" shows "Counting from must be a valid date." beside that field and no result.
Choosing between the Days Until St. Patrick's Day and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Days Until Labor Day](/date-calendar/days-until-labor-day/) | Days Until Labor Day | |
| [Days Until Father's Day](/date-calendar/days-until-fathers-day/) | Days Until Father's Day | |
| [Days Until Mother's Day](/date-calendar/days-until-mothers-day/) | Days Until Mother's Day | |
| [Days Until MLK Day](/date-calendar/days-until-mlk-day/) | Days Until MLK Day | |
| [Days Until Inauguration Day](/date-calendar/days-until-inauguration-day/) | Days Until Inauguration Day |
Background: date rules
Holiday dates are defined in three ways: a fixed day of the month, a weekday position such as the fourth Thursday of November, or a calendar calculation such as the date of Easter. Counts are in whole calendar days from the start date, and the date is the calendar date, not adjusted for your time zone or for days a workplace observes instead.
Assumptions and limitations
- Counting on the holiday itself gives 0
- After the date has passed this year the next year's date is used
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for counting from to confirm this.
Frequently asked questions
How many days until St. Patrick's Day from today?
Enter today as the start date. From 10 March 2024 the answer is 7 days.
What day of the week is it next year?
Upcoming weekdays: Monday 17 March 2025; Tuesday 17 March 2026; Wednesday 17 March 2027.
What does the Days Until St. Patrick's Day calculate?
Days until St. Patrick's Day. It returns Days Until St. Patrick's Day, Date, Weekday and Weeks and days.
What formula does the Days Until St. Patrick's Day use?
days = next occurrence of St. Patrick's Day − start date. Finds the next occurrence of St.
What is an example of a days Until St. Patrick's Day result?
With counting from 2024-03-10, the days Until St. Patrick's Day is 7 days.
Related calculators
- Days Until Labor Day — Days until US Labor Day (first Monday of September).
- Days Until Father's Day — Days until US Father's Day (third Sunday of June).
- Days Until Mother's Day — Days until US Mother's Day (second Sunday of May).
- Days Until MLK Day — Days until US Martin Luther King Jr. Day (third Monday of January).
- Days Until Inauguration Day — Days until US Inauguration Day (20 January after a presidential election year).
- Days Until Presidents' Day — Days until US Washington's Birthday / Presidents' Day (third Monday of February).
Sources
- US federal holiday rules: 5 U.S.C. § 6103
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.